v3.26.1
Employee Benefits - Roll forward, Remeasurements of Employee Benefit Plans (Details) - MXN ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of net defined benefit liability (asset) [line items]      
Amount accumulated in other comprehensive income as of the beginning of the period, net of tax $ 8,760    
Amount accumulated in other comprehensive income as of the end of the period, net of tax 10,501 $ 8,760  
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income      
Disclosure of net defined benefit liability (asset) [line items]      
Amount accumulated in other comprehensive income as of the beginning of the period, net of tax 1,964 923 $ 1,661
Actuarial (gains) losses arising from exchange rates (203) 190 (100)
Remeasurements during the year, net of tax 1,115 931 314
Actuarial (gains) and losses arising from changes in financial assumptions 598 957 223
Actuarial (gains) and losses arising from changes in demographic assumptions 6 1 (4)
Return on plan assets (404) (752) (92)
Changes in the effect of limiting a net defined benefit asset to the asset ceiling 345 (286) (546)
Effect of settlement 0 0 (533)
Total 1,457 1,041 (738)
Amount accumulated in other comprehensive income as of the end of the period, net of tax $ 3,421 $ 1,964 $ 923